Circuit breaker



FIG. 1 is a top plan view;

FIG. 2 is a front view;

FIG. 3 is a bottom plan view;

FIG. 4 is a rear view;

FIG. 5 is a right-side view, which is a mirror image of the left side;

FIG. 6 is a first perspective view; and,

FIG. 7 is an alternate perspective view. 

The ornamental design for a circuit breaker, as shown and described. 